Latest developments in debt ceiling standoff

Congress has until Aug. 2 to raise the federal borrowing limit or the government will run out of money and possibly default on its debt. House Republicans say they won't raise the debt limit without equal spending cuts. President Barack Obama and Democrats insist that higher revenues must be included.

Monday's developments: House Republicans and Senate Democrats offered competing legislation that narrowed their differences over how to avert a government default. House Republicans backed off an earlier insistence on $6 trillion in spending cuts to raise the debt limit while President Barack Obama dropped his longstanding call for increased government revenues as part of any deficit reduction plan.

What's next: House Republican leaders were expected to share details of their proposal to the rank and file and begin planning a vote, perhaps as early as Wednesday. In the Senate, Democratic leaders were expected to offer details of their plan.

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Some background:

Q: What is the debt ceiling?

A: It's a legal limit on how much debt the government can accumulate. The government takes on debt two ways: It borrows money from investors by issuing Treasury bonds, and it borrows from itself, mostly from the Social Security trust fund, which comes from payroll taxes. Congress created the debt limit in 1917. It's unique to the United States. Most countries let their debts rise automatically when government spending outpaces tax revenue. Congress has increased the debt limit 10 times since 2001.

Q: What is the federal deficit, and how does it differ from the debt?

A: The deficit is how much government spending exceeds tax revenue during a year. Last year, the deficit was $1.29 trillion. The debt is the sum of deficits past and present. Right now, the national debt totals $14.3 trillion - a ceiling set in 2010.

Q: Why is the prospect of not raising the debt ceiling so worrisome?

A: The government now borrows more than 40 cents of each dollar it spends. If the debt ceiling does not rise, the government would need to choose what to pay and what not, including benefits like Social Security, wages for the military or other bills. It also might delay interest payments on Treasury bonds. Any default could lead to financial panic weakening the country's credit rating, the dollar and the already hobbled economy. Interest rates would likely rise, increasing the cost of borrowing for the government and ordinary Americans.

Q: Who holds the $14.3 trillion in outstanding U.S. debt?

A: The U.S. government owes itself $4.6 trillion, mostly borrowed from Social Security revenues. The remaining $9.7 trillion is owed to investors in Treasury securities - banks, pension funds, individual investors, state and local governments and foreign investors and governments. Nearly half of that - $4.5 trillion - is held by foreigners including China with $1.15 trillion and Japan with $907 billion.

Q: How did the debt grow from $5.8 trillion in 2001 to its current $14.3 trillion?

A: The biggest contributors to the nearly $9 trillion increase over a decade were:

-2001 and 2003 tax cuts under President George W. Bush: $1.6 trillion.